Encoding to MP3 with a variable bitrate of 70-105 Kbps can be mapped to FFmpeg with the -q:a 8 option as below: ffmpeg -i show.m4a -c:a libmp3lame -q:a 8 output.mp3Īnd I suspect that this is your best option with your input file.Ĭonstant Bitrate (CBR) Encoding is a little over-used IMHO but if this suits your playback equipment best then it is a valid choice. ![]() This would be my own choice if only for the reason that the original AAC file is also a VBR file. And FFmpeg is certainly the best tool for both of these! So you actually have two reasonable choices: encode to a Variable Bitrate MP3 file or simply decide on a suitable bitrate for Constant Bitrate (CBR) MP3 encoding. ![]() I note that your input file is actually a Variable Bitrate (VBR) AAC file with an overall bitrate of 71.7 Kbps and a maximum bitrate of 93.8 Kbps.
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